Radius grinder



April 1944' w.. F. STEPHENSON 2,347,616

RADIUS GRINDER Filed Nov. 14, 1941 3 Sheets-Sheet l :NVENTOR ATTORNEYS April 25, 1944.

W. F. STEPHENSON RADIUS GRINDER Filed Nov. 14, 1941 3 Sheets-Sheet 2 ATTORNEYS Patented Apr. 25, 1944 UNITED; STATES TENT OFFICE p 2,s47,e1e

axioms GRINDER William F. Stephenson, Royal (ta-k, Mich. Appiicaticn November 14, 1941, Serial No. 419,184

Claims.

My invention relates to the art of grinding tools, gages and the like, and has among its objects and advantages the provision of an improved radius grinder.

In the accompanying drawings:

Figure 1 is a side elevational view of the invention; I V

Figure 2 is atop plan view;

Figure 3 is a front elevational view;

Figure 4 is a longitudinal sectional view;

Figure 5 is a view taken from the position indicated by line 5-5 of Figure 1;

Figure'6 is an elevational View of a spindle shaft;

Figure 7 is an end view of the spindle shaft; Figure 8 is a plan view of a micrometer screw Figure 9 is a sectional viewalong the line S9 ofFigure 8;

Figure 10 is a fragmentary view of one of the micrometer screws;

Figure 11 is an end view of a slide block having a dovetail rib and a dovetail groove;

Figure 12 is a face view of the slide block;

Figure 13 is an end view of a faceplate having a dovetail rib for reception in the dovetail groove in the slide block; and

Figure 14 is a face view of the faceplate.

In the embodiment selected for illustration, a spindle I0 is supported in bearings 12 of the angular contact type. These bearings are so arranged as to provide rigid axial supports in both directions, but the spindle may be oscillated in the bearings. Each bearing 12 is mounted in a recess I4 in an arm 16 of a bracket l8 having a supporting plate 20. Plate 20 is made secure by a conventional magnetic chuck structure 22 mounted on a base 24. A stop 26 is fixedly secured to the magnetic chuck 22 for engagement with the end 28 0f the plate 29.

One end of the spindle Ill is provided with a flange 30 bolted at 32 to a headplate 34. A short centering .pin 36 is provided on the flange $6 coaxially with the spindle l6 and receivable in a bore 38 in the headplate 34. In Figure 2, the headplate 34 is provided with a dovetail groove 40 for the reception of a dovetail rib 42,0n a slide plate 44. A faceplate 46 is provided with a dovetail rib 48, see Figures 1 and 4, receivable in a dovetail groove 5!) in the slide plate 44. The groove 59 in the plate 44 is arranged at right angles to the rib 42 on the slide plate 44. Thus the slide plate 44 may be shifted relatively to the headplate 34 longitudinally of the groove 40 in the headplate, and the faceplate 46 may be shifted relatively to the slide plate 44 longitudinally of the groove 50 but at right angles to the direction of travel of the slide plate.

The faceplate 46 constitutes a mount for work to be ground. Two intersecting grooves 52 are provided in the outer face of the faceplate, which grooves are arranged in right angular relation and serve as keyways for the reception of keys 54 on angles or other devices 56 bolted at 58 to the faceplate for supporting work in grinding proximity to the wheel 68. Figure 1 illustrates a snap gage 62' in position in the angles 55, but other types of work may be handled equally well by the grinder and supported by any suitable fix tures which may be bolted to the faceplate.

The wheel 60 is carried by a spindle structure 62 associated with an upstanding support 64, the spindle structure 62 being, of course, shiftable. The wheel 60 and its mount and operating means are old and well-known in the art and need not be described in greater detail.

In Figure 4, the rib 42 of the slide plate 44 is provided with a longitudinal bore 68 having a threaded extent it? for coaction with a screw 12 having a graduated head 14. A circumferential groove i6 is provided in the head 14 for the reception of a correspondingly curved lip 18 on a key plate 8%. Figures 8 and 9 illustrate the specific construction of the plate 89. This plate is fixedly secured to the headplate 34 by screws 82 threaded into the headplate 34 and having their heads countersunk in the plate 80.

Figure 4 illustrates the rib 42 as being provided with a recess 84 to provide accommodation for the head 14, as when the slide plate 44 is adjusted relatively to the headplate 34. While the screw 12 may be rotated for shifting the slide plate 44, the lip 18 restrains the screw from relative axial movement with respect to the headplate 34. Figure 2 illustrates an index line 86 on the plate for coaction with the graduations on the head 14.

Figure l, is provided for the head which plate is identical with the plate 89, so that the faceplate 44 longitudinally of the groove 50 in the same manner as the slide plate 44 is adjusted relatively to the headplate 34 through rotation of the screw 12. An index line I02 is provided on the plate I for coaction with the graduations on the head 98.

A gib I04 is positioned between one side face of the rib 48 and one side wall face of .the groove 50. Lock screws I06 are receivable in threaded openings I08 in the 'slideplate 44 and engage the gib for fixedly securing the faceplate 46 with respect to the slide plate 44 when once the precise relative positions have been determined. A similar gib H0 is positioned between one side face of the rib 42 and one side wall face of the groove 40, this gib also being engaged by lock screws H2 to the end that the headplate 34 and the slide plate 44 may be fixed in precise relative positions. The lock screws II2 are threaded into bores H4 in the headplate 34, which bores .are illustrated in Figure'l.

Referring to Figure 4, a circular plate H6 is provided with a central opening II8 for the reception of the shaft I20 comprising a smaller diameter continuation of the spindle I0. A key I22 secures the plate II6 against relative rotary movement on the shaft I20, and a washer I24 fits on the shaft I20 for pressing the plate II 6 against one of the bearings I 4. The shaft I20 is provided with a threaded pin I26 provided .with lock nuts I28 which clamp the washer I24 against the plate H6. The plate H6 is provided with a peripheral face I29 obliquely arranged to the plane of the plate and provided with graduations I30. A handle I32 secured to the plate -I I6 facilitates rotation thereof, andan index finger I34 is bolted at I36 to one of the arms I6 and coacts with the graduations I30 to facilitate observation of the degree of rotation imparted to the spindle I0.

Two split collars I36 and I38 are mounted on the spindle I0, each being provided with projections I40 coacting with a clamp screw I42 for fixedly clamping the collar upon the spindle. Figure illustrates the bracket I8 as being provided with a web I44 which constitutes a stop for limiting the rotary motion of the spindle I0 beyond predetermined limits. An adjustable stop pin I46 is threaded through an arm I48 on each of the collars I36 and I38 for engagement with the web I44. Thus the collars I36 and I38 may be rotated on the spindle I0 and made secure to vary the rotary range of the of tools and devices without resorting to the usual form grinding, which is frequently a tedious procedure if an element of precision is required. The slide plate 44 and the faceplate 46 may be shifted one to the other and with respect to the headplate 34 so as to position the point of intersection between the grooves 52 coincident with the axis of the spindle I0.

After the work has been secured to the faceplate 46, the slide plate 44 and the faceplate 46 i are relatively shifted through the medium of the 2,347,616 .plate 46 may be adjusted relatively to the slide respective micrometer screws I2 and 96 to locate the work in proper relation to the spindle axis. The entire assembly, which comprises the spindle, the headplate 34, the slide plate 44, the faceplate 46 and the work, may then be rotated as a unit. The axis of the radius to be ground is located coaxially with the axis of the spindle I0, and the assembly is rotated relatively to the grinding wheel 60.

Of course, the perimeter, of the grinding wheel is set at a distance above or laterally of the axis of the spindle I0 corresponding to the radius to be ground. The stopping action of the collars I36 and I38 prevents rotation of the spindle beyond predetermined limits, so as to guard against rotation of the assembly beyond the predetermined limits to facilitate blending of the radius being ground into a straight surface of the work, or with respect to another curvature on the Work. The device is particularly suitable for radius grinding with respect to snap gages 1 having radiuses on gage points, cutaway plug gages with radiuses on gage lips, and the unlimited number of forms in connection with punctures and die elements requiring accurate radiuses.

Without further elaboration, the foregoing will so fully illustrate my invention, that others may, by applying current knowledge, readily adapt the same for use under various conditions of service.

I claim: 7

l. A work holder for a radius grinder, comprising a supporting plate, arms extending upwardly from one end of the plate, a web located between and connected to the arms, a spindle journaled in the arms above the web, a face plate carried by the spindle, means for operating the spindle, collars secured to the spindle between the arms, and stop members extending radially from the collars for contact respectively with opposite sides of the web to limit the movement of the spindle in both directions.

2. A work holder as set forth in claim 1, where'- in the collars are secured to the spindle means adapted to permit their adjustment on the spindle to vary the angular relation of the stop members.

3. A work holder as set forth in claim 1, wherein the stop members'comprise arms extending radially from the collars and screws extending transversely through the arms for contact with adapted to permit their adjustment on the spindle to vary the angular relation of the stop members, and wherein the stop members comprise arms extending radially from the collars and screws extending transversely to the arms for contact with the web, the screws being adjustable on the arms with relation to the web. V

5. A work holder for a radius grinder, comprising a supporting plate, arms extending upwardly from one end of the plate, a spindle journaled in the arms parallel to the plate, a face plate, means of securing the face plateto t he spindle directly above the supporting plate, said means being adapted to permit the face plate to be adjusted radially with relation to the spindle, and means for operating the spindle.

WILLIAM F. s'rEP son} 

